/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns a valid new display name for a control
Returns the name to use for the to-be-added element.
[FName](API\Runtime\Core\UObject\FName) GetSafeNewDisplayName ( const [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) & InParentElement, const [FString](API\Runtime\Core\Containers\FString) & InPotentialNewDisplayName ) const